1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (c) 2018 Máté Eckl <ecklm94@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include "internal.h"
#include <stdio.h>
#include <stdint.h>
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/expr.h>
#include <libnftnl/rule.h>
struct nftnl_expr_tproxy {
enum nft_registers sreg_addr;
enum nft_registers sreg_port;
int family;
};
static int
nftnl_expr_tproxy_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
switch(type) {
case NFTNL_EXPR_TPROXY_FAMILY:
memcpy(&tproxy->family, data, sizeof(tproxy->family));
break;
case NFTNL_EXPR_TPROXY_REG_ADDR:
memcpy(&tproxy->sreg_addr, data, sizeof(tproxy->sreg_addr));
break;
case NFTNL_EXPR_TPROXY_REG_PORT:
memcpy(&tproxy->sreg_port, data, sizeof(tproxy->sreg_port));
break;
default:
return -1;
}
return 0;
}
static const void *
nftnl_expr_tproxy_get(const struct nftnl_expr *e, uint16_t type,
uint32_t *data_len)
{
struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
switch(type) {
case NFTNL_EXPR_TPROXY_FAMILY:
*data_len = sizeof(tproxy->family);
return &tproxy->family;
case NFTNL_EXPR_TPROXY_REG_ADDR:
*data_len = sizeof(tproxy->sreg_addr);
return &tproxy->sreg_addr;
case NFTNL_EXPR_TPROXY_REG_PORT:
*data_len = sizeof(tproxy->sreg_port);
return &tproxy->sreg_port;
}
return NULL;
}
static int nftnl_expr_tproxy_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_TPROXY_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_TPROXY_FAMILY:
case NFTA_TPROXY_REG_ADDR:
case NFTA_TPROXY_REG_PORT:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int
nftnl_expr_tproxy_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
struct nlattr *tb[NFTA_TPROXY_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_expr_tproxy_cb, tb) < 0)
return -1;
if (tb[NFTA_TPROXY_FAMILY]) {
tproxy->family = ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_FAMILY]));
e->flags |= (1 << NFTNL_EXPR_TPROXY_FAMILY);
}
if (tb[NFTA_TPROXY_REG_ADDR]) {
tproxy->sreg_addr =
ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_ADDR]));
e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_ADDR);
}
if (tb[NFTA_TPROXY_REG_PORT]) {
tproxy->sreg_port =
ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_PORT]));
e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_PORT);
}
return 0;
}
static void
nftnl_expr_tproxy_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_TPROXY_FAMILY))
mnl_attr_put_u32(nlh, NFTA_TPROXY_FAMILY, htonl(tproxy->family));
if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR))
mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_ADDR,
htonl(tproxy->sreg_addr));
if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT))
mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_PORT,
htonl(tproxy->sreg_port));
}
static int
nftnl_expr_tproxy_snprintf(char *buf, size_t remain,
uint32_t flags, const struct nftnl_expr *e)
{
struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
int offset = 0, ret = 0;
if (tproxy->family != NFTA_TPROXY_UNSPEC) {
ret = snprintf(buf + offset, remain, "%s ",
nftnl_family2str(tproxy->family));
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR)) {
ret = snprintf(buf + offset, remain,
"addr reg %u ", tproxy->sreg_addr);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT)) {
ret = snprintf(buf + offset, remain,
"port reg %u ", tproxy->sreg_port);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
}
return offset;
}
struct expr_ops expr_ops_tproxy = {
.name = "tproxy",
.alloc_len = sizeof(struct nftnl_expr_tproxy),
.max_attr = NFTA_TPROXY_MAX,
.set = nftnl_expr_tproxy_set,
.get = nftnl_expr_tproxy_get,
.parse = nftnl_expr_tproxy_parse,
.build = nftnl_expr_tproxy_build,
.output = nftnl_expr_tproxy_snprintf,
};
|
